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प्रश्न
Name three animals which can hear ultrasonic vibrations.
एका वाक्यात उत्तर
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उत्तर
Certain creatures like dogs, bats, dolphins, and mosquitoes can detect the waves.
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या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 5: Acoustics - Evaluation [पृष्ठ ७२]
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संबंधित प्रश्न
How do we produce sound ?
Explain the terms 'crests' and troughs' of a wave? What type of waves consist of crests and troughs?
What do you understand by amplitude of an oscillation?
What do you understand by sound signalling?
What causes sound?
Complete the following sentence :
Sound is produced by a ___________ body.
Match the pairs.
| Group ‘A’ | Group ‘B’ |
| (a) Flute | (1) Frequency less than 20 Hz |
| (b) Frequency | (2) Frequency more than 20000 Hz |
| (c) Sound level | (3) Vibrations in the air |
| (d) Ultrasonic sound | (4) Measured in Hz |
| (e) Infrasonic sound | (5) Decibel |
On placing your ear close to an iron railing which is tapped some distance away, sound is heard twice. Explain, why?
he sound of an explosion on the surface of a lake is heard by a boatman 120 m away and by a diver 120 m below the point of explosion. Out of the two persons, who would hear the sound first? Why?
Explain the types of mechanical waves.
